Glaze breaking tool for gas engine valve seats



Jan. 16, 1934. w. J. KATTREIN v GLAZE BREAKING TOOL FOR GAS ENGINE VALVESEATS Filed July 12, 1930 INVENTO-R William Jlfalirez'n WATTORNEYPatented Jan. 16, 1934 UNITED STATES PATENT OFFICE GLAZE BREAKING TOOLFOR GAS ENGINE VALVE SEATS Application July 12, 1930. Serial No. 467,396

6 Claims.

This invention relates broadly to improvements in valve reseating toolsand more particularly to an improved tool for preparing gas engine valveseats for subsequent finishing operations.

An object of the invention resides in the provision of a glaze breakertool for breaking up and removing the hardened surface metal from thevalve seats of engines that have become hardened and worn from use.

A prominent feature of the invention, is to provide a tool of the typespecified, having radially and longitudinally adjustable and readilyremovable seat abrasive units of semi-cylindrical semitubularconstruction for presenting convex ,abrasive surfaces to the glaze tofacilitate the glaze removal.

Structural features present in the glaze breaker tool consists of asolid head having a central bore and a conical face provided withchannel precision seats or grooves to receive one or both legs ofsemi-tubular file units capable of being adjusted to compensate forwear, and means for locking the file units in adjusted positions in saidgrooves.

Another feature resides in the semi-tubular breaker files which may befile cut on the convex or outer surface and may also be tapered from endto end.

In the accompanying drawing I have illustrated different embodiments ofmy invention relative to the means for holding the breaker files inclamped operative position on the head, and I reserve the right tochange the construction as may be required for various conditions ofuse, within the scope of the invention claimed.

The several views of the drawing may be described as follows:

Fig. 1 is a side elevation of my improved glaze breaker tool, theadjustability of a breaker-file being indicated by dot and dash lines.

Fig. 2 is a bottom face view of the tool.

Fig. 3 is a bottom face view of the head with the breaker-files removed.

Fig. 4 is a side view of a breaker-file.

Fig. 5 is an end view thereof.

Fig. 6 is a detail fragmentary section taken on the line 6-6 of Fig. 2.

Fig. 7 is a view similar to Fig. 6 but showing a modified form ofbreaker-file clamping means.

Fig. 8 is a similar view but showing a further modified form ofbreaker-file clamping means.

Referring to the drawing, 10 designates a preferably circular solid headof cold rolled steel, which is formed with a conical under face 11, anda central slightly tapered bore 12, to receive a handled spindle (notshown) for manipulating said head, as by back and forth rotation. Thehead is further provided with tangential channel seats or grooves 13,and a corresponding number of tapped sockets 14, for the reception ofscrews or bolts 15, having flat heads adapted to contact with one sideor leg 1'? of semi-tubular breakerfiles or file bars 16, to lock thatside or leg in adjustable engagement with the bottom of said grooves 13,the opposite leg edge of each of said breaker-files 16 resting on theconical face 11 of the head 10, for precision, as shown in Fig. 6

of the drawing. The legs of the breaker-files and the bottoms of saidgrooves are plane and flat to provide precision contact, thus offeringno undesirable movements of the breaker-files when locked in operativeposition.

By referring to Fig. 2 of the drawing it will be seen the grooves 13 andclamping screws 15 are so positioned that the longitudinal axes of thebreaker-files are in registration with the axis of the head 12, in otherwords, the said breakerfiles are truly radial to the center of the head;but I may place the said breaker-files at other angles relative to thecenter of the head 10 if desired, or if found advisable. The plain legor flange 17 constitutes a holding portion or handle for the file 16.

By tapering the grooves 13, and also the file bars, from their outer totheir inner ends, as seen best in Figs. 1 and 4, said bars may be movedfurther inwardly, or towards the axis of the head, so that even theextreme outer ends of the file cut surfaces may be used. The files aretherefore cut away, in part, at their inner ends, although the full areaof the filing surfaces is maintained throughout the length of the files.In Fig. 7 of the drawing I show a modified form in which the head 10 maybe provided with a broad channel 20 for each of the breaker-files 16,both edges of both legs of said files resting fiat therein forprecision, and one leg being interlocked with a clamp screw 21; and inFig. 8 I show a further slight modification, in which I employ doublegrooves 22, for each breaker-file 16, to receive both leg edges thereof,a screw 23, being in clamping engagement with one of said leg edges.

The radial adjustment of the breaker-files is accomplished by reason ofthe side angular contour or tapering of said files, as best disclosed inFig. 4, the flat faces of the base of the legs at one side, operativelyresting on the bottoms of said grooves and the opposite leg base faceresting on the conical portion of the head, for precision. -l10 What Iclaim is:

1. In combination, a circular head having a central tapered bore, aconical face having tangentially extending grooves and adjacent threadedsockets semi-tubular, breaker-files partially resting in said groovesand partly on said conical face, said breaker-files having convexabrasive faces; and devices in said threaded sockets for locking saidbreaker-files in said grooves.

2. A glaze breaker for gas engine valve seats, consisting of a headhaving therein a plurality of grooves, concavo-convex file unitsadjustable on said head, each unit having one side resting on said headand the opposite side resting in one of said grooves, and means coactingwith said grooves for holding said concavo-convex file units inoperative position.

3. A glaze breaker for gas engine valve seats, embodying a head having aconical face and tangential grooves therein; semi-tubular file unitseach mounted with one side resting on said face and the other sideresting in one of said grooves, and means for locking said units to saidhead.

4. A glaze breaker of the class described embodying a supporting headhaving a central bore and of frusto conical cross sectional contour, theconical face thereof being formed with tangential grooves having flatbottoms, cross sectionally curved semi-tubular file bars secured to saidhead with one side leg of each bar resting fiat on the bottom of eachgroove and with the opposite side legs of each bar resting fiat on theconical face of the said head adjacent said grooves thereby providingprecision seats for each bar, and means for securing said bar to saidseats.

5. A glaze breaker for valve seats including in combination a conicalhead having an axial bore, said head having radially disposed grooves inits conical surface, files slidably mounted in said grooves and havingtapered inner ends whereby to secure increased inward movement thereof,and means for securing said files in selected positions.

6. A glaze breaker for valve seats including in combination a conicalhead having an axial bore, said head having radially disposed grooves inits conical surface, said grooves having flat boundary faces, filesmovably mounted in said grooves and having tapered inner ends whereby tosecure increased inward movement thereof, said files including convexabrasive surfaces and having fiat faces which slidably engage the firstmentioned faces, and means for securing said files in selectedpositions.

WILLIAM J. KATTREIN.

